Microfilaments are composed mainly of a protein called
A. Actin
B. Tubulin
C. Myosin
D. Chitin

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Detailed Solution

Proteins and Their Functions

Tubulin
- Belongs to the globular protein superfamily.
- Forms microtubules, which are an essential part of the cytoskeleton in eukaryotic cells.
Myosin
- A member of the motor protein superfamily.
- Plays a crucial role in muscle contraction.
- While associated with microfilaments during contraction, myosin itself is not the structural component of microfilaments.
Chitin
- Found in the cell walls of fungi and in the exoskeletons of arthropods, as well as in the radula of mollusks.
- Provides structural support but is not related to microfilaments.
Actin
- A multifunctional globular protein found in all eukaryotic cells.
- The main structural protein of microfilaments.
- Plays a critical role in maintaining cell shape, motility, and intracellular transport.